GoKawiilReddit modder vents PC heat outdoors with automated split water-cooling loop
A Reddit user known as Motor_Attention1865 built a PC water cooling system that routes coolant to an external 240mm radiator outside in winter, keeping excess heat from warming their heated-floor room. An Arduino Mega with temperature probes and a Python script controls a three-way valve, opening it to send coolant outdoors only when needed and keeping the coolant above the dew point to avoid condensation. The heavily watercooled PC itself includes a delidded Core Ultra 7 270K Plus, an RTX 4070 Ti Super, and watercooled RAM, alongside internal 120mm and 360mm radiators fed by an EK Kinetic D5 pump.